'We'll want it back for study, you mean,' she said.

He nodded and she continued to look at him. After a moment she gave him a slow nod in reply, and a look that meant 'later', then she addressed the AI. 'Hubris, how far gone is the probe's integrity?'

'It is still capable of taking high G. The weaknesses seem to be developing only in the ceramal components. The probe has a foamed alloy skeleton.'

'What could cause that? The cold?' Cormac asked.

Chaline shook her head in perplexity. 'Ceramal? No… Hubris, what is the temperature outside the probe?'

'One-eighty Kelvin.'

'I don't know why I asked. Ceramal retains its structural integrity down to ninety Kelvin.'

'Acid? Some kind of caustic gas?' asked Cormac.

'No, has to be something more specific than that, else the sampling process would have picked it up… Wait a minute… Hubris, how old were the Samarkand run-cible buffers?'

'The Samarkand runcible was installed solstan 2383.'

'Yes,' said Chaline with satisfaction. Cormac raised an eyebrow and she went on. 'Wide-spectrum superconductors were introduced in 2397. The Samarkand runcible had the old sort; super-conducting ceramic-impregnated tungsten steel and bathed in liquid helium. The room-temperature superconductors they had then couldn't take the kind of surge a runcible buffer receives. We are talking about a huge EM pulse here.'

'And?' asked Cormac, wondering why she felt it necessary to over-explain her area of expertise.

'Don't you see? Tungsten steel impregnated with ceramic? That is what ceramal is.' Cormac nodded. 'So whatever screwed up those buffers is now screwing up your probe.'

Chaline said, 'Hubris, would it be possible to run an interior microscan of the probe?'

'Scanning.'

'What do you expect to find?'

'Sabotage… too specific to be anything else.'

'How?'

'Well, the buffers would have been too cold for some kind of manufactured virus, and are screened to everything bar neutron radiation, so it has to be nano-machines.'

'If it is nanomachines… can you do anything about them? Will you be able to set up your runcible down there?'

Chaline chewed on her knuckle. 'They would have survived a fusion explosion… Getting rid of them is like getting rid of a disease: there's always one bacillus survives to start the process off again. But… but they are not prone to mutation like a bacillus or virus. Once we get a sample, we should be able to make a counter-agent.' She glanced up at his puzzled expression. 'Counter nano-machines, ones with the singular purpose of hunting down and destroying the nanomachines there. It would take ages though, and years for Samarkand to be clear.'

'And the new runcible?'

'Oh, we can protect it. There isn't a great deal of ceramal used in its construction. The buffers are carbon-seventy-based superconductors. The nanomachines won't touch them. We will need to set up a proscription scan like that used for weaponry.'

Cormac waited for her to continue.

'To stop it getting taken off planet,' she explained, as if tired of dealing with an idiot. 'Samarkand would also have to be limited to runcible transport until it's clear. Therefore, no ships.'

'As a way station it wouldn't get many anyway,' Cormac said.

'True,' said Chaline, and returned to pushing chips back into place.

'Nanomycelium detected,' said Hubris, before the silence between them became too stretched.

'Mycelium?' asked Cormac.

Chaline looked round and frowned. 'Fibres like a fungus; we need to get some here for analysis. We'll have to use class-one isolation—'

Hubris interrupted. 'It will not be necessary to bring it here. Nanomycelium also detected in shuttle bay.'

Suddenly warning lights began flashing on the walls and the voice of the AI was heard throughout the ship.

'Warning, possible hull-breach in shuttle-bay area. Section fifteen to be sealed in ten minutes.'

Downlink Com was not in section fifteen. Cormac, Chaline and the five technicians watched the screens showing that section. There was no panic. If the situation had been dangerous, Hubris would have sealed the section and the people would have been evacuated in emergency suits. As it was, they walked to the section's exit looking mildly annoyed. At that exit four technicians waited with hand scanners that bore a disturbing resemblance to truncheons. They ran these over each of the evacuees, paying particular attention to the soles of their footwear. While they watched, one irritated man, an ophidapt with a spined crest on his bald head, had to remove his shoes and toss them in a canister by the exit.

'Will the detector pick them all up?' Cormac asked.

No one felt inclined to answer him.

'Let us hope you can make a counteragent, then,' he finished.

They watched as the section was finally cleared, and the doors closed and hermetically sealed.

'Hubris, we need samples,' said Chaline.

The picture being showed to them changed to a view into the shuttle bay. The camera zeroed in on a section of polished floor. On the floor were dull footprints from which spread black fibres like dry rot. The camera pulled back to show a little remote drone hovering a few centimetres from the floor. It was a chrome cylinder not much bigger than a man's forearm. All along its underside it had pairs of manipulators. In one crab claw it held a sample bottle. As it approached the footprints another arm unfolded. By one of the footprints that arm folded down and smoke spurted up. The yellow laser beam only became visible in that smoke as the drone meticulously cut two strips of flooring, levered them up with what could only be a screwdriver, and dropped them in the bottle.

'I'll have to get down to Isolation,' Chaline said to Cormac. 'I have a lot of work to do. The entire hull of this ship is ceramal.' She waited a moment for him to say something. Cormac let her go without comment.

Back in his cabin, Cormac called up a view into Iso- lation and watched the dracomen eat yet another meal. Could it have been them? he wondered. Somehow that did not seem Dragon's style. It was possible, but why would Dragon do such a thing? Why would Dragon want the people of Samarkand killed? Or perhaps he was asking the wrong question. Why would Dragon want the Samarkand runcible destroyed? He shook his head. There was not yet enough evidence to put any theories together.

'Hubris, any luck with that submind?'

The AI's reply was quick and succinct. 'I do not have the capacity to spare for it at the moment.'

'The mycelium?'

'Two-thirds of my capacity is being used for decoding it and designing a counteragent.'

'OK, can you put me through to the submind?'

'Yes.'

'—throw away archetypes but keep ideas bathwater baby hell hath no hungry mole lord of pain lord of pain where is edge? Sinter snapping hove to green rotting fruit—'

Running his finger down a touch-strip Cormac turned the sound down. He said to the submind, 'The runcible buffers were destroyed by a nanomycelium.'

He turned the sound back up.

'—hungry hungry eater green green grass is green fell into the rainy day bleed break men lizard Janus—'

Men lizard?

'Who destroyed the runcible buffers?'

'—gain gone flee on invisible wings rotting fruit blackthorn thorns peach—'

Cormac clicked the voice off. For a moment he thought he had something there, but would the runcible AI have known who planted the mycelium? It seemed unlikely. Had it known, it would have transmitted more information before its destruction. Had it known, it would have instantly shut down the runcible. Freeman might have ended up lost in underspace, but that would have been better than him causing the deaths of 10,000 people.

'Hubris, show me that mycelium in the shuttle bay.'